[BAEKJOON_26005 - JAVA] 나뭇잎 학회

문제

https://www.acmicpc.net/problem/26005

26005번: 나뭇잎 학회

JAVA 코드

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        int N = Integer.parseInt(br.readLine());

        int result = N * N / 2;
        if (N == 1) {
            result = 0;
        } else if (N % 2 == 1) {
            result += 1;
        }

        bw.write(String.valueOf(result));
        br.close();
        bw.flush();
        bw.close();

    }

}